Date of this Version
Consideration is being given to suspend or restrict the use of endrin for controlling mice in orchards. If endrin were not available for this use, State extension and experiment station personnel in 6 Eastern States and 2 Western States estimated that apple production losses would increase from mice injury on 33,400 endrin-treated bearing acres, (12,500 acres in the Eastern States and 20,900 acres in the Western States). The 6 Eastern States include Georgia, Maryland, North Carolina, South Carolina, Virginia and West Virginia: the 2 Western States are Idaho and Washington. Estimates of production changes without endrin were made assuming zinc phosphide is the only feasible Federally registered chemical alternative to endrin. Chlorophacinone and diphacinone, potential alternatives to endrin are being used in some States under special permits. State registrations are in effect for one or both of these rodenticides in all of the 8 States, except Georgia and Maryland. Research data on these 2 materials are limited and although the efficacy results appear promising, it would be premature to consider them as alternatives to endrin for control of mice under a wide range of field conditions.